Fix trailing whitespace.

Author: ZeroIntensity

Doc/glossary.rst

@@ -1211,7 +1211,7 @@ Glossary
       In :term:`CPython`, reference counts are not considered to be stable
       or well-defined values; the number of references to an object, and how
       that number is affected by Python code, may be different between
-      versions. 
+      versions.
 
    regular package
       A traditional :term:`package`, such as a directory containing an